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CONTRACT <br />PAGE 2 <br />entire planning area showing all streets, street names on the <br />street, surface water impoundments, railroads, streams, <br />quarries, bridges, drainage ways, highways and highway names. <br />d. Provide a total of one (1) index for the aerial photos and <br />topographic maps for the entire planning area. <br />e. Provide control data and diagrams describing placement of <br />survey monuments. <br />5. Conditions. <br />A. All aerial photographs and topographic maps shall be on 24" x <br />36" sheets and cover an area of 4000' x 6000'. <br />B. Topographic maps shall: <br />(1) Display sheet number and north arrow. <br />(2) Display graphic scales in feet and varas. <br />(3) Comply with the National Mapping Standards of Accuracy <br />both in plan and elevation. <br />(4) Be co-ordinated on and display the Texas State Co-ordinate <br />System-North Central Zone. <br />(5) Be horizontally controlled by extending the existing U. S. <br />Coast and Geodetic Survey monuments by Geodimeter and <br />Theodolite measurements with further densification by <br />Aero Triangulation with an A-5 Autograph. Vertical <br />control shall be extended from existing U.S.C. and G.S. <br />Bench Marks by spirit leveling. <br />(6) Use the format like the example attached hereto as Exhibit <br />B and made a part hereof. <br />C. The error in relation between map projections and the plotted <br />position of any horizontal control point shall not exceed 0.01 <br />inch of their true positions at the map scale. Ninety percent <br />(90q) of all well-defined planimetric features mapped shall be <br />located within 0.025 inches of their true geographic position <br />at the map scale; no features shall be displaced more than 0.05 <br />Inches. <br />D. Ninety percent (90%) of all contours and elevation of points <br />interpolated from contours shall be accurate within one-half (2) <br />